Identify the problem with the method used to obtain a random sample.Karine is a market researcher who is interested in the opinions of the adult residents of her town regarding a new freeway. She obtains a sample of 120 adults by interviewing every 20th adult who leaves the library .
A. The sample is too small.
B. By choosing every 20th person she introduces bias into the sample. Not all of those leaving the library have an equal chance of being selected.
C. The sample is biased. People leaving the library are not representative of all residents of the town.
Answer: C
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Evaluate the integral.
A. 5 B. 0 C. -10 D. 10
Solve the problem.The grade resistance F of a car traveling up or down a hill is modeled by the equation F = W sin ?, where W is the weight of the car and ? is the angle of the hill's grade (? > 0 for uphill travel, ? < 0 for downhill travel). Find the weight of the car (to the nearest pound) that is traveling on a 
downhill grade and which has a grade resistance of 
lb.
A. 4000 lb B. 4300 lb C. 4100 lb D. 3800 lb
Solve the following system of linear inequalities by graphing.-2x + y < 2-2x + y > -1
A. No solution
B. 
C. 
D. 
Solve.Kozy Communications, Inc., is planning a new cellular telephone. For the first year, the fixed cost of setting up the production line is $46,100. The variable cost for producing each telephone is $70. The revenue from each telephone is $235. Find the profit or loss from the production and sale of 13,400 telephones.
A. $2,164,900 profit B. $4,040,900 profit C. $2,257,100 profit D. -$614,591,070 loss